Process of manufacturing sublimed lead pigment from galena ore



(No Model.)

G. T. LEWIS. PROCESS OP MANUFACTURING SUBLIME-D LEAD PIGMENT FROM GALENAORE.

latente @WW1/Leases UNITED STATES PATENT OFFICE.

GEORGE T. LEVIS, OF PHILADELPHIA, PENNSYLVANIA.

PROCESS 0F MANUFACTURING SUBLIMED LEAD PIGMENT FROM GALENA ORE.

SPECIFICATION forming part of Letters Patent No. 386,836, dated July 31,1888.

Application filed December 7, 1886. Serial No. 220,942. (No model.)

To a-ZZ whom it may concern:

Be it known that I, GEORGE T. LEWIS, of Philadelphia, State ofPennsylvania, haveinvented a new and useful Improvement in the Processof Manufacturing Sublimed Lead Pigment from Galena Ore, of which thefollowing is a true and exact description, due reference being had tothe accompanying drawing` which forms part hereof.

Heretofore the manufacture of lead pigment from galena has been carriedon in the manner set out in several patents granted to me and E. O.Bartlett, either separately or jointly, by directly snbliming galeriaore, the galeria being thrown upon a hot fire by a blast of air, whichblast of air is forced into thc mass of ore and fuel, or by blowingpowdered galena ore into red-hot retorts. It has also been made by relining the waste fumes and flue-dust of lead smclting furnaces. In allthese cases a solid fuel has been used, and its use has been found inmany respects very disadvantageons, the mineral impurities of the coal(ashes) and the irregularity in feeding being liable to discolor thepigment; also, the silicious ashes cause a loss of lead, a portion ofthe lead being thrown into the slag. The use of retorts has also beenfound disadvantageous on account ol' their great expense. By mydiscovery l am enabled to obviate all these objections.

I take powdered galcna orc, and this is ntimatelymixed with natural orgenerated gas or liquid hydrocarbomand this admixtnre burned in anigniting-chamber. The galeua will be completely oxidized; and this iscarried off by an exhaust and forced into receptacles of textile fabric,where it is collected.

In the drawings, C represents the hopper, into which the powdered ore isplaced. This hopper has an outlet, d, and against this ontlet a blast ofair, D, is blown. The gas is caused to enter through the channel A, andat the point a the gas is mixed with the finelydivided ore blown by thcblast. The finelydivided ore, gas, and air are blown through thereverberatory-shaped chamber B, which is preferably lined with basicmaterial. In this chamber the gas is ignited, by which means the leadore is oxidized. Any coarse galena falls to the bottom of this chamberand is removed. The oxidized ore is carried into the settling-chamberE.` Any coarse material or heavy particles fall t0 the hopper F and areremoved. The fan J draws the finely-divided particles of oxidized orefrom the iguitingchamber through the cooling pipes H, and drives themthrough the pipe M into the bags K, of textile fabric, where it isdeposited.

Any liquid hydrocarbon can be used in place of the gas, and when it isused I do away with the gas-channel A and mix the finely-divided Ore tobe heated with the liquid hydrocarbon in the hopper C, and thefinely-divided orc so Saturated is blown into the chamber B, where thehydrocarbon is ignited, and the operation continues in the mannerheretofore described in this specification.

By this admixtnre of air, gas, or liquid hydrocarbon and pulverized oreprior to their introduction into the combustionchamber, I am enabled tocause the air and gas or liquid hydrocarbon to become so intimatelymixed with each other prior to combustion that when combustion commencesits effect on the ore is more perfect and rapid on account of the closeconnection ofthe ore and gas or liquid hydrocarbon with each other.

I do not intend to claim, broadly, the use of gas as a fuel inthemanufacture of lead pigments.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The process of manufacturing subliined lead pigment from finely-dividedgalena, which consists in forming acomponndcurrentofi ntimately-adinixedgas, air, and finely-divided galena before entering thecombustionchamber, in-

tlaniing said current at the point of entrance into said chamber,maintaining the resultant salts in suspension by the air-blast whilebeing forced through said chamber, cooling the material obtained by thecombustion of the gas and galena, and finally depositing thelead saltsby forcing them into receptacles of textile fabric, substantially as setforth.

GEORGE T. LEV IS.

Witnesses:

R101-ID. S. CHILD, Jr., FRANK CROWN.

